The magnitude of the force on a block is and the block moves with speed

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

The magnitude of the force on a block is

40\,\text{N}

and the block moves with speed

3\,\text{m\,s}^{-1}

. If the angle between the force and the velocity is

60^{\circ}

, the instantaneous power developed is (a)

120\,\text{W}

(b)

60\,\text{W}

(c)

104\,\text{W}

(d)

20\,\text{W}